Imo000

I shaved 2 tenths off the 1/4 mile with nothing more than a chip set, on a 100% stock car. Went from a 13.7sec to a 13.5sec for $40!

Catfood

So not to hijack the thread or anything. But if I purchase a chip set for my S4 and the x-pipes how much power would I be making. Car is all stock otherwise.

The chips claim 30hp gain and the x-pipes claim 20. The car is 320 horse stock, so that means I would have maybe 350-360 hp when both are installed? Any experience would be appreciated.

Mike Frye

I don't think it works that way. You can't just add all that stuff together, and I think the numbers you're quoting are crank hp, not at the wheels.

From what I've read, the S4s don't gain as much from just a set of chips because the timing and fueling is already pretty well set up. The reason the S3s can pick up so much is that they were the first 32v cars and the factory tuning was very conservative. As mentioned earlier in this thread, there are no knock sensors in the '85-'86 so you take a chance if you run more aggressive tuning, especially with lower octane gas.

Catfood

I always run premium and I fill up at chevrons and shells only. I added a chip to my old 944S and I easily gained 15 ft lbs of torque. Autothority usually does a good job of holding true to their claimed gains. Im also aware that throwing parts on a car is not a cumulative process. I am just trying to decide the best way to mod my car with my limited budget.

Landseer

Mike, where are you running your timing on the two banks?

James-man

15 mpg is a dream

pcar928fan

As I said, I have a stock '88 S4 auto. RMB and AA chips is all I have done to it and make 266 to the ground... Good bit of tuning by someone who knows what they are doing and you could probably break 300 to the ground in HP and Tq... Probably need some mapping or at least a good read on lean/rich and the proper adjustment. Advance the cam timing a few degrees as well. Add the AA chips, RMB, X-pipe and I would say 320 to the ground would not be unreasonable to expect... probably right around there anyway. It would be nice to have someone do that experiment and keep track of it each step of the way.

dr bob

In the wayback era, we added AA chips to Phil Tong's GT, and gained maybe 10HP. This was back-to-back dynojet runs. His car had RMB but x-pipes weren't available yet. That was 8 years ago, no telling if the programming from AA has improved since then.

I added the same set to my '89 S4 and had noticeable results. It felt quicker. Hot ambients, low RPM's, AC running, and a firm push made audible pings so I pulled them. They are in the parts storage bin someplace. I need to do an intake clean and refresh, de-carbon, new plugs and wires. Then try them again. I drive the car like a white-haired senior citizen anyway, so I'm not sure if there would be a benefit for me anyway. You young whippersnappers would likely enjoy the extra push.

dr bob

Hatch--

Get the car running right BEFORE you put chips in it. Focus on the basic stuff first. Build a good cake before you add the icing.

PorKen

I never looked closely before, but I ran the eBay S3 chip images I have through the disassembler again. (I have images from two different vendors, they are exactly the same.) Sure enough, on both the EZF and LH, there are Autothority copyrights on the tail end of the code.

(C)APP

The EZF has a second notice, in an unused map area (Autothority Performance Engineering).

(C)A.P.E.1991


The EZF is based on a ~428 factory chip. 227 bytes changed (incl. the copyrights). WOT map unchanged. The cruise map is 2°-10°(!) advanced over stock, mostly 6°. The 10° area corresponds with the LH fuel dump.

The LH is based on a ~721 chip. 51 bytes changed (incl. the copyright). No rev limit change. WOT map unchanged. Fuel dump at ~3/4 load in the base map, otherwise unchanged.


Maybe there are newer versions?

mark kibort

So, is there any proof AT ALL that the chips do anything but lighten your wallet?
If the only differnce is a spark change of advance, hard to imagine much more than a gain in peak torque of less than 10ft-lbs being the only expected gains.

PorKen

At least on this 1991 version, there is no WOT advance, all the advance is in the cruise map.

There is more fuel between 1400-3600 rpm @ 3/4 load (a l-o-t more fuel between 2300-2700), which should help torque, but the high rpm is stock (too rich for max hp).

Gtaebr

Wow 35 bytes is used by Autothority Performance Engineering!

(37 if they use the brackets)

No wonder you only use the one chip for us 86.5rs Ken!

Mike Frye

Not sure if I'm the Mike you're asking, but I recently set it to 4 degrees advance both sides with the performance chips in there. I haven't run it in any hot weather and I'm actually thinking of dialing it back just a bit, but I'm not sure.

I'll let you know in a few weeks. I'm going to the dyno and plan to do this comparison. I've got a spare LH/EZ setup so I can swap them out in 2 minutes on the floor between runs.

chaadster

How can you seriously ask that question?

There's ALL KINDS of proof...did you miss Dr. Bob's post in THIS THREAD on Tong's 10hp gain in his GT?

There are many, many before/after dyno sheets posted here and elsewhere that show gains in max Hp and Tq.